A. Ghazvinian - Faculty member, Tarbiat Modares University, Tehran, Iran
M. Monjezi - Faculty member, Tarbiat Modares University, Tehran, Iran
M. R. Hadei - Research scholar, Tarbiat Modares University, Tehran, Iran
H. R. Nejati - Research scholar, Tarbiat Modares University, Tehran, Iran

Metro construction projects should technically and economically be optimized to achieve maximum efficiency. In this regard, selection of an excavation method is very important so as to not interfering available civil services and not imposing additional expenditures. Development of various new construction methods such as New Austrian Tunneling Method (NATM), Cut and Cover, Cover and Cut has provided a suitable environment for the design engineers to adopt the most appropriate excavation alternative. In this study, the most popular construction methods of underground metro stations are discussed. Also, different methods of ground pre-supporting systems for controlling instability of excavated underground space (convergence) and subsidence in urban area is explained

Metro construction projects, NATM, Cut and Cover, Cover and Cut